Sustenhorn-Zone
Back to Aar MassifRepresentation and status
- Color CMYK
- N/A
- Color RGB
- R: 241 G: 239 B: 237
- Rank
- tectonic zone
- Validity
- Unit is in Use
- Status
- valid
Nomenclature
- Deutsch
- Sustenhorn-Zone
- Français
- zone du Sustenhorn
- Italiano
- zona del Sustenhorn
- English
- Sustenhorn zone
- Origin of the Name
- Historical Variants
-
Zone der Hornblendeschiefer (Baltzer 1888, Hugi 1922, Hugi 1934), Südlicher Teil der Zone der Serizitschiefer und -gneise (Alb. Heim 1921), Ofenhorn-Stampfhorn Unit (von Raumer et al. 1993a), Sustenhorn-Zone (Labhart et al. 2016), Sustenhorn Zone (Berger et al. 2017)
Hierarchy and sequence
Geography
- Geographical extent
- Zwischen Lötschental und oberes Val Russein.
References
- Definition
-
2017) :
Geological Map of the Aar Massif, Tavetsch and Gotthard Nappes. Geological Special Map 1:100'000, Explanatory Notes 129
p.26: The Sustenhorn Zone extends from the Lötschental in the southwest to the upper Val Russein in the northeast and was first introduced by LABHART et al. (2015 a, b) for the portion of the Meiental map sheet of the Geological Atlas of Switzerland 1:25000. The main difficulty in correlating different segments is related to the highly variable volumetric ratio of the two major rock types characterising the Sustenhorn Zone: (1) various types of amphibolites and (2) migmatitic biotite gneiss. Furthermore, the two rock types may alternate in layers at any scale or form separated but coherent bodies of hundreds of square metres in size. This resulted inevitably in various cartographic representations of this unit on different map sheets. Where possible, larger amphibolite layers have been distinguished or adapted in their representation in respect to the map scale. Where this was not possible due to small-scale layering or missing information, the same colour for both rock types was used. In spite of all these drawbacks, it is interesting to note that all descriptions of the concerned rocks are very similar, supporting the choice to group them into the same unit (HÜGI et al.1988, ABRECHT 1994, LABHART et al. 2015 b).
The intrusive contact of the plutonic rocks of the Haslital and the Fruttstock Groups mainly defines the southeastern boundary of the Sustenhorn Zone. Noteworthy are large inclusions of up to 200m length of the Ofenhorn-Stampfhorn Gneiss Complex in the Central Aar Granite (ABRECHT 1994).
(
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Ofenhorn–Stampfhorn-Gneiskomplex
- Rank
- lithostratigraphic Formation
- Status
- informal term
- In short
-
Prävariszische polyzyklische Biotit-Plagioklas-Gneise der Sustenhorn-Zone, meist gebändert und migmatisch mit diskordanten Leukosomen, sowie amphibolitischen und ultramafitischen Einlagerungen.
- Age
- Precambrian
-
Straligenstöckli-Gneiskomplex
- Name Origin
- Rank
- lithostratigraphic Formation
- Status
- informal term
- In short
-
Prävariszischer polyzyklischer granitischer Gneis der Sustenhorn-Zone.
- Age
- Precambrian
-
Chrüzlistock-Migmatit
- Name Origin
- Rank
- lithostratigraphic unit
- Status
- informal term
- In short
-
Migmatitischer Biotit führender Plagioklasgneis, Schollenmigmatit.
-
Piz-Cuolmet-Gneiskomplex
- Name Origin
-
Piz Cuolmet (GR), nördlich Disentis/Muster
- Rank
- lithostratigraphic unit
- Status
- informal term
- In short
-
Fein- bis mittelkörniger gebänderter Serizit-Plagioklasgneis der Sustenhorn-Zone, häufig als Lagenmigmatit ausgebildet. Lokaler Serizit-Chloritschiefer.
-
Tamina-Gneiskomplex
- Name Origin
-
Tal und Fluss der Tamina (SG)
- Rank
- lithostratigraphic Formation
- Status
- informal term
- In short
-
Prävariszischer polyzyklischer Gneiskomplex der Sustenhorn-Zone im Vättis-Fenster.
- Age
- Archean